乘 5：乘 10 再除以 2
乘 5 时，先乘 10，再取一半。
先试三张
点一下卡片翻过来，看看为什么。
11 × 2
11 × 2 = 2211行，每行2个，一共22个。
9 × 5
9 × 5 = 459行，每行5个，一共45个。
8 × 10
8 × 10 = 808行，每行10个，一共80个。
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开始练习本卡组全部 36 道题
- 2 × 2 = 4
- 3 × 2 = 6
- 4 × 2 = 8
- 5 × 2 = 10
- 6 × 2 = 12
- 7 × 2 = 14
- 8 × 2 = 16
- 9 × 2 = 18
- 10 × 2 = 20
- 11 × 2 = 22
- 12 × 2 = 24
- 1 × 2 = 2
- 2 × 5 = 10
- 3 × 5 = 15
- 4 × 5 = 20
- 5 × 5 = 25
- 6 × 5 = 30
- 7 × 5 = 35
- 8 × 5 = 40
- 9 × 5 = 45
- 10 × 5 = 50
- 11 × 5 = 55
- 12 × 5 = 60
- 1 × 5 = 5
- 2 × 10 = 20
- 3 × 10 = 30
- 4 × 10 = 40
- 5 × 10 = 50
- 6 × 10 = 60
- 7 × 10 = 70
- 8 × 10 = 80
- 9 × 10 = 90
- 10 × 10 = 100
- 11 × 10 = 110
- 12 × 10 = 120
- 1 × 10 = 10
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